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Head-to-head evidence comparison — which supplement is right for you?
Benzoyl Peroxide vs Tretinoin (Retin-A): they're closely matched on evidence (9 vs 8/10); they're alternatives for clearer skin (acne) — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Benzoyl Peroxide and Tretinoin (Retin-A) are closely matched across evidence, studies, and safety.
Verdict
Too few graded studies
Top outcomes
Verdict
Too few graded studies
Top outcomes
Shared outcomes (2)
Outcomes where both Benzoyl Peroxide and Tretinoin (Retin-A) have evidence — compare verdict strength side-by-side.
Topical OTC use. Benzoyl peroxide is used at 2.5-10% in gels, creams, and washes, applied to acne-prone areas once or twice daily; lower strengths (2.5-5%) are usually as effective as 10% with less irritation. There is no oral or systemic dose — it is not ingested. It is often combined with a retinoid (e.g. adapalene) for greater effect. This library does not provide an ingestion protocol.
Any time of day
Leave-on gel/cream (2.5-5%) or a fixed combination with a retinoid
Prescription topical: a pea-sized amount of 0.025%-0.1% cream or gel applied to clean, dry skin once nightly. Start low-strength and every-other-night to build tolerance. A prescription drug used under clinician direction — not a supplement regimen.
Before bed
Topical cream or gel, 0.025%-0.1% (prescription)
Can oxidize and inactivate tretinoin if layered at the same time; separate to different times of day.
Discuss with your healthcare provider before combining.
Throughout
4-12 weeks
Throughout
First weeks
12-24 weeks
12-24 weeks
Months
8-12 weeks
Topical benzoyl peroxide for acne.
Cochrane Database Syst Rev (2020) · Systematic review
Pooled 120 RCTs (29,592 participants); BPO more effective than placebo/no treatment for participant-reported improvement (RR 1.27, 95% CI 1.12 to 1.45)
Efficacy of topical treatments for mild-to-moderate acne: A systematic review and meta-analysis of randomized control trials.
J Eur Acad Dermatol Venereol (2025) · Meta analysis
Network meta-analysis of 35 RCTs (33,472 participants) comparing nine topical acne agents
Adapalene-benzoyl peroxide, a fixed-dose combination for the treatment of acne vulgaris: results of a multicenter, randomized double-blind, controlled study.
J Am Acad Dermatol (2007) · Rct · n=517
517 subjects randomized double-blind to adapalene-BPO, adapalene, BPO, or vehicle for 12 weeks
Topical tretinoin improves photoaged skin. A double-blind vehicle-controlled study.
JAMA (1988) · Rct
Randomized, double-blind, vehicle-controlled trial of topical tretinoin for photoaged forearm and facial skin
Tretinoin emollient cream: a new therapy for photodamaged skin.
J Am Acad Dermatol (1992) · Rct
Multicenter double-blind vehicle-controlled trial of tretinoin emollient cream for photodamaged skin
Long-term treatment of photoaged human skin with topical retinoic acid improves epidermal cell atypia and thickens the collagen band in papillary dermis.
J Am Acad Dermatol (2005) · Open label
Long-term topical retinoic acid on photoaged human skin assessed histologically
Both Benzoyl Peroxide and Tretinoin (Retin-A) are closely matched — the best choice depends on your specific health goals.
For clearer skin (acne), Benzoyl Peroxide has a higher relevance score (85 vs 75).
Can oxidize and inactivate tretinoin if layered at the same time; separate to different times of day. Discuss with your healthcare provider before combining. Consult a healthcare provider for personalized advice.
AM/PM order, what to combine vs separate, and why sunscreen always comes first.
Benzoyl peroxide & retinoids → salicylic/azelaic/niacinamide → naturals, tiered by evidence.
The proven core (sunscreen, retinoids, vitamin C) vs the viral hype tier — honestly tiered.
The depigmenter playbook (hydroquinone, azelaic, tranexamic, vitamin C) with sunscreen as the spine.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.